Nuvolasdk

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* Compute micro version from git and add it to `metadata.json`
* Update gitignore generator.
* Two spaces are use for the indentation of JSON files.

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* Nuvola 3.0 compatibility mode was removed.
* The `nuvola-app-xxx` binary launcher was replaced with a shell script, which is now always included.
It requires Nuvola 4.10. Consequently, `--with-dbus-launcher` configure option was removed.
* Individual apps now use the `eu.tiliado.WebRuntimeApp...` unique id.
* AppStream Addon XML metadata are generated. Issue: tiliado/nuvolasdk1

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* Default API version is 4.9.
* Sync version with Nuvola Runtime.

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* desktop launcher: Spaces around the equals sign were removed because they confuse kbuildsycoca5.
Issue: tiliado/nuvolaruntime365 Upstream ticket: https://bugs.kde.org/show_bug.cgi?id=310674
* Added individual version info properties - `nuvolasdk.VERSION_MAJOR/MINOR/MICRO`.
* new-project: New `metadata.in.json` files use the latest Nuvola SDK version.

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* genmakefile: Add `-link` suffix to compat symlinks to workaround Debian not being able to replace a directory
with a symlink. Issue: tiliado/nuvolaruntime362
* dbus launcher: Rename Diorite to Drt.
* Added version info - nuvolasdk.VERSION.
* genmakefile: It is possible to specify required Nuvola SDK version.

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* new-project, convert-project: User is asked for git name and git email if they are not set.
* Happy Songs demo was updated to include progress bar and volume level.
* genmakefile: Wrong dbus launcher command in desktop file was fixed. Issue: tiliado/nuvolaruntime348
* genmakefile: Legacy nuvolaplayer3_xxx icon symlinks are created only in Nuvola 3.0.x compat mode.
Issue: tiliado/nuvolasdk3
* Fixed compatibility with Nuvola 4.5.0.